(1B) The product $(a+b)(c+d)$
Practice
Expand and simplify.
*Write your answers with powers of $x$ in descending order. $\left(\square x^2 \pm \square x \pm \square\right)$
$\left(x-5\right)\left(x+5\right)$
$\left(x-2\right)\left(x+7\right)$
$\left(x+7\right)\left(-1+x\right)$
$\left(-x+8\right)\left(6-x\right)$
$\left(8-x\right)\left(x-6\right)$
$\left(-5+x\right)\left(x+5\right)$
$\left(-6+x\right)\left(-9+x\right)$
$\left(-8+x\right)\left(4-x\right)$
$\left(x-8\right)\left(5x-2\right)$
$\left(-6x+7\right)\left(x+5\right)$
$\left(-7x+3\right)\left(1+8x\right)$
$\left(3x-4\right)\left(6-5x\right)$
$\left(-4+5x\right)\left(x+8\right)$
$\left(9+x\right)\left(3x+5\right)$
$\left(-1+5x\right)\left(-2+5x\right)$
$\left(8+x\right)\left(5+2x\right)$